The feature, which has been available in beta form via Google Labs for some time, will initially be available only on Android phones and tablets. You'll need to select "My Places", and add a new offline map before you depart. (See screenshot above).

The full content of the area you've selected will then be available to you, in all its zoomable glory.

No launch date has been announced for the new feature.

The search giant announced the update at an event in San Francisco Wednesday, where the company is also expected to announce 3D maps. Check back shortly for more news from the event.

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